1 How do you feel today? Do you have lots of energy? Are your eyes bright and clear? Can you focus on your work?2 Or do you feel tired and grumpy? Are your eyes read and have dark circles under them? Are you having trouble paying attention? If so, you may not be getting enough sleep.3 Teens and young adults need eight to nine hours of sleep every night. Yet most only get six or seven. You may stay up late talking on the phone, doing homework, or playing videogames. But this can be hazardous to your health.4 Sleep helps your body in many ways. You feel and look better after a good night's sleep. You have more energy. Your body is better able to fight disease.